Pitchlink,
While I agree it's not the sort of question you would ask at the first interview for this, I thought that was a perfectly valid question to be asked here. Surely when you are paying out 30k, admittedly a fraction of the total cost, for this training you have a right to know how much they are going to pay you at the end of it. You have to be realistic about these things, people have morgages/loans etc that have to be covered.